library(plotly)
# Steps and plot for each day
steps <- list();fig <- plot_ly()
ChW<-ChickWeight;ChW$Time<-as.factor(ChW$Time)
for (i in  1:length(levels(ChW$Time))) {
  fig <- add_boxplot(fig,x=ChW$Diet[ChW$Time==ChW$Time[i]],
                     y=ChW$weight[ChW$Time==ChW$Time[i]],
                     visible = (ChW$Time==ChW$Time[i]), 
                 name = ChW$Time[ChW$Time==ChW$Time[i]], type = 'box')
  
  step <- list(args = list('visible',
               rep(FALSE, length(levels(ChW$Time)))),
               method = 'restyle',label = ChW$Time[i])
  step$args[[2]][i] = TRUE  
  steps[[i]] = step 
}  

# Slider control to select day number
fig<-fig%>% 
    layout(title = 'Chickweight for different diets',
           yaxis = list(title = "Weight (g)"),
           xaxis = list(title = "Diet"),
           legend = list(title=list(text='<b> Days </b>')),
           boxmode = "group")

fig <- fig %>%
  layout(sliders = list(list(active = 0,
                             currentvalue = list(prefix = "Days: "),
                             steps = steps)))
fig